A high-energy-density and long-life initial-anode-free lithium battery enabled by a Li2O sacrificial agent

Yu Qiao, Huijun Yang, Zhi Chang, Han Deng, Xiang Li and Haoshen Zhou ()
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Yu Qiao: National Institute of Advanced Industrial Science and Technology
Huijun Yang: National Institute of Advanced Industrial Science and Technology
Zhi Chang: National Institute of Advanced Industrial Science and Technology
Han Deng: National Institute of Advanced Industrial Science and Technology
Xiang Li: National Institute of Advanced Industrial Science and Technology
Haoshen Zhou: National Institute of Advanced Industrial Science and Technology

Nature Energy, 2021, vol. 6, issue 6, 653-662

Abstract: Abstract Equipped with a fully lithiated cathode with a bare anode current collector, the anode-free lithium cell architecture presents remarkable advantages in terms of both energy density and safety compared with conventional lithium-ion cells. However, it is challenging to realize high Li reversibility, especially considering the limited Li reservoir (typically zero lithium excess) in the cell configuration. In this study we have introduced Li2O as a preloaded sacrificial agent on a LiNi0.8Co0.1Mn0.1O2 cathode, providing an additional Li source to offset the irreversible loss of Li during long-term cycling in an initial-anode-free cell. We show that O2− species, released through Li2O oxidation, are synergistically neutralized by a fluorinated ether additive. This leads to the construction of a LiF-based layer at the cathode/electrolyte interface, which passivates the cathode surface and restrains the detrimental oxidative decomposition of ether solvents. We have achieved a long-life 2.46 Ah initial-anode-free pouch cell with a gravimetric energy density of 320 Wh kg–1, maintaining 80% capacity after 300 cycles.

Date: 2021
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DOI: 10.1038/s41560-021-00839-0

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